Liberals go on their anti-gun rants every time there are reports of gun violence. So the invention of “smart guns” would seem to be a win-win for all involved. But one of those smart guns, the Armatix IP1, apparently has a vulnerability. A hacker has found the kryptonite for the Armatix IP1 — and it’s a $15 magnet.

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The Armatix IP1 is a smart gun that will, in theory, not fire unless it’s in close proximity to the watch that comes with the firearm, according to Wired, who did an in-depth analysis of the gun.

The manufacturer of the gun claimed that the weapon would “usher in a new era of gun safety,” but a hacker who goes by the alias Plore claimed he’d found a way around the built-in safeguards. He said he could jam the communication between the watch and gun and fire the weapon. And he did just that at a Colorado gun range.

“I almost didn’t believe it had actually worked. I had to fire it again,” he said. How did he outsmart a watch and firearm combo that retails for $1,500 and is advertised as foolproof? With a $15 magnet that was readily available — that’s how.

“And that’s how I found out for $15 of materials you can defeat the security of this $1,500 smart gun,” he said. But even he was surprised at how easily he was able to do it.

“If you buy one of these weapons thinking it’ll be safer, it should be,” Plore told the Daily Mail. “I was confident I’d be able to break it… I didn’t think it would be so easy.” Plore was able to use radio signals as well as phone transmissions up to 12 feet away to jam the gun’s communication with the watch.

An Armatix spokesperson responded to the news of their smart gun being deemed useless with a magnet by citing: “There was never the demand to avoid the usage by a well-prepared attacker or a skilled hacker.” Adding, “If you have access to a safety device for a sufficient time, you are able to modify it and probably can misuse it.”